Call selector



. (battery, storage battery, generator,

Patented Jan. 10, 1928.

PATENT OFFICE.

LOUIS L. E. CHAUVEU, 0]! PARIS, FRANCE.

' eau. SELECTOR.

Application filed August 17, 1922, Serial No. 582,546, and in France August 19, 1921.

The present in vcntion relates to a new type of call selector. The object of this apparatus is to cause the actuation of a callin device (bell, etc). The apparatus may %)e conlrolled over wires or by means of wireless telegraPhy and is responsive t0 signals composed of groups'of impulseg or difierent duration, e. g. letters of the Morse code composed of dots and dashes.

The apparatus is so arranged that the calling device is actuated on1y when the selector receivcs the predetermind group of sigflals for Which it is adjusted. All other groups of signals, no matter how arranged, do not actuate the calling device.

In the following description, the invention isexemplified as applied to a selector schematically illustrated in the drawing. In

the draWing, the arrows marked or indicate connections -with the and poles, respectively,of a source of electricity etc.) not shown in the drawing;

1 is a contact which may be closed manixally or by means of any suitable relay (not shown) controlled by a receiver for wireless or wire telegraphy. This contact 1 controls the circuit of magnet 2 in such a manner that the magnct is energized-u1aon each closure et the contact and while the contact is closed. When the key 1 is actuated, the circuit of magnet 2 is closed'from-the source of energy, through wire 32, armature 33, contact 33, magnet 2, key 1, wire '38, contact 39,'armature 39, to Armature 3 is thenidrawn to magnet, and rod 3 car' rying this armaturepivots about the axis 3 therby drawing downwardly the pawl 4 and causing the rotation of the tooth whcel 5' by a step in the direction of the arrow. The wheel 5 bas as many teeth as there are impulscs in the code employed if the code consists of combinations formed of' equal nuinbers ofimpulses. If not, the number of the teeth on the Wheel may beequal to the number of the impulses in the combination comprising the highest number ofimpulses, in case not all the combinationsare com posed of the same number of impulses. I he apparatus is providcd also with a stoppmg awl 4:. at 5 to the frame of the device'andis urged into engagement with the teeth of wheel 5 -by a tension spring 6. A lever mechanism comprises a verticalrod 7 pivoted to rod 3 The. stopping pawl 4 is pivoted Which carries the armature 3 actuated by the magnet 23, a horizontal lever 8 pivoted near 1ts conter at 9' to one end of which is pivoted yertical rod 7 and to the Other nd of Which 1 s fastened the push member 10 for actuatmg the paWl 4 out of engagement with the teeth of the wheel when the magnet 23 is energized. Coil spring 11 tends to return the wheel 5 to its normal position When released by pawl 4.

The magnet 2 controls also two sets of reversing contacts 7, 7' and 6*, 6 through switcharms 7 a and 6 respectively normally closed on the lower contacts 7*, 6". When the magnet 2 is energized, it attracts armature3", moving switch-arms 6 and 7 upwardly to contact with the upper contacts 6*, 7 thereby closing the circuitthrough the self-locking magnet 8. The circuit Will then be from magnet 8, wire 40, junction 93, wi re 41, contact 6", switcharm 6 to Consequently at each closing of the key the mag net 8 is energized and attracts its two armatures 9 and 10". The armature 9' being closed against contact 9, the circuit will then be from magnct 8, contact 9, armature 9", wire 42, contact 26, armature 26", wire 445 to in such a manner that as long} as the contact 26 is closed, the magnet 8 will then be energized even if the circuit from magnet 8, junction point 9", wire 41, contact 6, switch-arm 6* t0 is broken.

The armature 10 (retracted in the absence of signals against the contact 10 Will be attracted by the magnet 8 and to move against thecontact l0 and close the circuit of the slow releasing relay 27, that is, from armature 10, contact 10 wire 43, relay 27 to At the sanie time the armaturc 10" having left the contact 10 opens at this point the circuit of the slow releasing relay ll, from: through armature 10, contact 10 wire 45, slow releasing relay 11, wire 44%, to The opening of this last circuit releases the armatures 12 and 26 of the slow releasing relay 11; the contact 12, open in the absence of si nals, Closes; the

contact 26, closed in the a sence of signals,

(according to which signal received the first, second, etc., from the beginning of the group) corresponding wires 14 or 15, contacts 17 and 19 being joined to wire 15 and contacts 18 and 20 joined t0 wire 14, contacts 7 (for wire 15) or 7 (for wire 14), switch. arm 7 (for both), junction point 7, Wire 13, contact 12, armature 12 to (a).

As a sequence to the above, on closing the contact 12 a current can be sent through Wire 15 or Wire 14., depending on the position of the switch-arm 7 through its association With contact 7 and 7 that is to say, by the opening of key 1 (which corresponds to the application of 7 to 7*).or by its closure 7? against 7.

'lhe slow releasing relay 11 is an electromagnet of the slow releasmg type employed in automatic teelphoncs and is regulated in such a manner that its contact 12, which is open in the absence of signals closes only aI'tcr the expiration of a space of time corresponding to the duration of a dot after the closing of key 1 so that the closing et contact 12 can be efi'ected: (a) at the moment when the key 1 has been released, when the signal has been a dot; (6) at the moment when this key is still contacting when the signal is a dash. In the first case, at the moment when the switch-arm 7 is transmitting current by conscquence of the closing of contact 12, the switeh-arm 7 will already have had the time to return into a position of repose, that is to say, against the contact 7"; the current must then continue its path through the wire 15. In the second case, at the moment When the closure of contact 12 sends current through switch-arm 7, the latter has not yet lett 7*, since the key 1 is still closed and the current is directed across contact 7 through Wire 14. This constitutes the disposition et the apparatus for the automatic selection of Wire 14 and 15, according as the signal received is a clash or dot.

The opening of contact 26 (simultaneously with the closing of contact 12) produces the opening of the circuit: from magnet 8, wire 40, contact 9, armature 9*, wire 42, contact 26, armature 26, line 44 t0 Now the magnet 8 can only be energized through the following circuit: r0m magnet 8, wire 40, jimction point 9, wirc .41, contact 6, sWitch-arm 6 to If the signal received is a dot, this last circuit is already open at the moment et the opening et contact 26; consequently the magnet 8 iS de-energized and, at the expiration of time equivalent to a dot, after the beginning of the signal, ceases to attract its armatures: the situation corresponding to the ahsence of signals, is re-established and the whole apparatus is ready to receive a ncw signal.

If the signal received is a dash, that is to say, if, when at the opening et contact 26, the key 1 :is still depressed and the switch arm 6' still rests against 6*, the magnet 8,

after the opening of its feed circuit passing through contact 26 continues to be fed by another circuit, whose continuity is main-- tained by the switch-arm 6 and contact 6, so that thcy engage, that is to say, as long as the key 1 is dcprcssed. \Vhen this key is open the supply current for magnat 8 and its action ceases; the apparatus is then in a position of repose.

lt 1s neccssary to provide means for controlling the-order et the signals in the group.

For this purposc, the whecl 5 carrics a pro jection 16 Which in advancing encounters in succession the contacts 17 18, 19, 20 and 21.

'\Vhen the first signal is received, the pro jection 16 engagcs contacts 17, When the sec 0nd signal is received the projection 16 engages the contact 18, etc. litho group for which the apparatus is adjusted is such that the first signal is a dash, the contact 17 is'.

connected With the line over which the dots are sent, and the other contacts 18, 19 and 20 are also connected to the line corresponding to the other signal than the one for which the apparatus is adjusted.

It Will be seen thcrefore that, if the group of signals sent is the one for which the apparatus is adjusted, the contacts 17, 18, 19 and other hand, the group of signals reccivcd does not correspond to the adjustment Of the apparatus, one of the al ovc montioncd contacts placed under current and conduots the current through the frame of the apparatus to the magnet 223, through the ollowing circuit: ii'om contact 25, aire 46, niagnct 223, ground (i ground (3P), wheel 5, projection 16, one of: the contacts 17 to 26, corr0sp0nding wircs 17 to 20, Wircs 14 or 15, switclnarm 7*, corresponding contact 7 or 7 junction point 7, wirc 13, contact 12 to This muguet becomes cnergized and actuates the driving pawl 4 and the pawl 4, whereupon the Wheel 5 is returned to its normal position under the control of the spring 11.

If the signal is not the Correct one, the Wheel 5 is returned to its normal position and the projection 16 cannot pass by contacts 17 to 20 unless the signals are the ones for which 4 the apparatus is adjusted.

The magnet 23 is provided with a locking contact 24 whereby the supply current for the circuit of this magnat is assured from current for the magnat 23 has been broken' in the mannar indicated, the supply current for magnat 23 is still maintained by means of the following circuit: from contact r 2 2.), w1re 46, magnat 23, ground (x (ground G wire 24, contact 24 to When the holding magnat 8 is energized, it closes through its actuated armature 10 the circuit of slow releasing magnat 27. The function of the latter is to control the durafion of the silent perod separating the impulsas of the same code signal. In response to each impulse received, the magnet 27 is energized. If the impulses follow in normal succession, i. a. if the duration of the silent periods separating two consecutive signals is inferior to the time for which the slow re-' 4 separating two signals is superior or equal .to this t1me, the armature 28 1s closed.

Since at this time the magnet 2 is in normal condition, the switch-arm 6 connects the pole of the battery with the lower contact 6", and establishs the following circuit: from switch-arm 6*, contact 6", wire 47, contact 28, ground Gr" (ground G magnet 23, wire 46, contact 25 to whereupon the restoring magnat 23 is energized.

. The apparatus will, therefoi'e, be restored to normal When the silent period is too long.

VVhen the signals receivad are the ones for which the apparatus is adjustcd, and if these signals are sent out in normal succession, i. e. separated by suitabla silent intervals, the projection 16 may advance until contact 20 is reached. Two conditions may now obtain; the. group of signals receivcd may be either the one for which the apparatus is adjusted or it may comprise an additional signal.

In the first case, the group received will l)( iollowed by a longer silent period than the normal interval batween the signals. Under these conditions, the silence controlling magnat 27 allows its contact to close and the ringing magnat 31 is energizad from through magnat 31, wire 30, contact 22, wire 29, contacts 28", 28?, wire 47, contact 6", switcharm 6 to Magnat 31 closes contact 33 completing the Circuit of the call-bell S. At the same time, the'magnet 31 looks up through contact 34 to the pole until the apparatus is stopped, eithar loy hand or by means of a key 35. When the magnat 31 operates, the magnet 2 is dis- .connected fron'i the polo in contact 33.

For this reason, the S1gnals that might be sent later on, will not be received until the magnat 31 is returned to its normal condition upon the actuation of key 35.

through switch-arm 6*, contact 6*, Wire 4 contact 28, armature 28, ground G* (ground G magnat 23,'Wire 46 to contact 25. The magnat 23 therafore actuates the pawls, and the wheel 5 is returned to its normal position.

In the second case, if the group of signals recaived is followed by another signal instead of a silent period of suflicient duration, the .wheel 5 will advance by one notch. Asa result, projection 16 will now engage contact 21, and the following circuit will be closed: contact 25, wire 46, magnat 23, (ir G,, 16. contact 21, wire 21, junctiou point 7, wire 13, contact 12, armature 12 to No matter what kind of an extra signal is received, the magnet 23 will be energized and the appaiatus will rcturn t0 normal without ringing the bell.

The calling device therefore cannot be actuated by a group of signals composed of the same signals as the group for which the apparatus is 'adjnsted but comprising an additional signal (dash or dot). In this manner, if the Morse code is used and the apparatus is adjusted for the latter S o it will not respond to the latter H or the latter V On the other hand, an apparatus adjusted for a group is prevented IOIT. responding to the final signals of 'another group (a. g. in the case of the latter S to the latter B After the first signal (a dash), the

* Wheel 5 in rturning to its initial position opens at contact 36 the connection betwcen -apparatus is adjustad' for a certain group of signals, the calling device does not respond unless the group is normally sent out, i. e. it is neither prcceded nor succeeded by any signal and the periods for spacing the signals are not too long. In this manner, the system adjusted for a certain group cannot be actuated by elements of other consecutive groups.

The above description Was givan merely for the purpose bf.exemplifying the invention, the arrangement disclosed rclating to a group of signals corresponding to the latter C of the Morse code. Obviously, the apparatus may be subjected to various modifications or simplifications depending on the particular application desired. The type and construction of the relays and magnets is arbitrary, the main thing being that these relays perform the 'unctions clisclosed.

The apparatus may be uscd to respond to call signals, such as groups of lettcrs in wire css tclegraphy for ships. In this case the numbcr of the contacts 17 to 20 will be made equal to the total number of signals forming the diferent letters of the call indication. The contacts corresponding to dashes must bc fcd to wire 15, the signals correspoliding to dots must be fcd to wire 14.

'lhe contact 22 closcd by the last signal impulse is connectcd to wirc 29.

Let it be supposcd that one desircs to prepare the apparatus for the registering of the signal NOw, the first contact 1", the third 19, the fifth (Which being the. last of the group is alwa: s the 20 corresponding to dots, must be joined t0 wire 14; the second and the tourth contact 18 and a supplemcntary contact must be joined to wire 15.

Obviously the group of contacts may be so disposcd as to respond to a diversity of signals arranged with a view to avoiding at-' mospheric distu1bances resulting in a false call.

In the case of transmission over Wircs, the apparatus may be simplifiecl, whenever possible, by substituti1ig in the place 01: the Morse code, a code composed of groups comprising a uniform number of signals. The numbcr of the signals forming the groups of such code depends on the number of the stations t0 beselected, and the number of the contacts 17 to 20 will vary accordingly. The group to which the apparatus is responsivc may be varied at will b'y chang' ing the connections of contacts 17 to 30.

A certain elasticity in the cadence ofoperation inay boobtaincd by proper adjustment of the slow acting magnets 11 and 27 in such a manner that, the contact 1 may lue mannally controllcd.

In addition to itsuse asa call selector, this apparatus may be used also as a selector for controlling distant mechanical functionsor as a telephone or telegraph selector.

Having describcd my invention, what I claim is:

1. An apparatus for selectively causing an indication under the action of premeditated electrical impulses of the Morse type, comprising, in combination, a work circuit, a movable element, electrical means for moving said movable element step by step through equal portions of its path on reception of each current impulse, means for causing energization of the work circuit in the final position of the moi7able clement, and

means to immediately return said movable ele1nent t0 initial position on the reception of an unpremeditated impulse for the partion lar position of the movable element.

2. An apparatus for selectively causing an indication under the action of premeditated eiectrica'l impulses of the Morse type, comprising, in combination, a work circuit, a movable element, electrical means for moving said movable element step by step through equal predetermined distances on rcception of each impulse, mosans for causing energization of the work circuit in the final position of the movable-element, means for restoring said movable elemcnt t0 initial position on the reccption of an unpremeditated impulse for the particular position of the movable element, and means for causing actuation of the restoring means upon the expiration of a predetermined time interval aftcr the termination of a received impulse at any position of the movable element.

3. An apparatus for selectively causing an indication under the action of premeditated elcctrical impulses of the Morse type, comprising, in combination, a work circuit, a movable member, electrical means for moving said movable member step by step through equal predetermined distances on reception of each impulse, means for causing encrgization of the work circuit in the final position of the movable member, means for restoring the movable member to initial position, means for immediately causing actuation et the rcstoring means on the reception of an unpremeclitated impulse for the particular position of the movable member, said means including a series of contacts to be sequentially engaged by the movable member during its movement, and other electrical means for causing actuation of' the restoring means upon the expiration of a predetermined time interval during which no impulse -is received, said electrical lneans comprising a slow releasing relay controlled by the im pulses.

4. In a call selector, menus, responsive to received impulses, a movable member actuated step by step by the impulse responsive means, dotand dash lino conductors having a plurality' ot' contacts associated therewith, the movable member contacting with one of said contacts upon the reception of each impulse, the arrangement being sucli that When the proper impulse is received circuits associated With the line conductors romain open, but When an improper impulse is rece1ved these circuits are closed, a restoring relay energized when said lime conductor circuits are closed, and means actuated by said restoring relay for returning the movable member to initial position.

5 The c0mbination as claimed in claim 4, together with electrically operated means controlled bythe impulses and connected to the restoring relay for causing restoration of the movabhinember to initial position at the expiration of a predetermined period of time during which no impulse is received.

6. In an apparatus for selectively causing an indication under the action of premedi tated electrical impulses of the Morse type, a source of energy, two lines, means to encrgiz6 oithor of said limes according as the impulse received is short 01 long, means for 10 making successive connections to said lines aocording to the inverse of the premeditated sequence of impulses to be receivcd, and means for immediately restoring'the'apparatus to its initial position when the impulses received do not correspond to said predetermined sequence of impulses.

LOUIS LUCIEN EUGENE CHAUVEAU. 

